Foraminifera of the Gault of Folkestone. By F. Chapman. 327 
Ammodiscus gordialis Jones and Parker sp., plate VI. fig. 13. 
Trochammina squamata-gordialis Jone3 and Parker, 1860, Quart. 
Journ. Geol. Soc., vol. xvi. p. 304. T. gordialis Carpenter, 1862, 
Introd. Forarn., p. 141, plate xi. fig. 4. Ammodiscus gaultinus 
Berthelin, 1880, Mem. Soc. geol. France, ser. 3, vol. i. Mem. 5, 
p. 10, plate i. fig 3, a, h. A. gordialis Brady, 1884, Cliall. Rep., 
vol. ix. p. 333, plate xxxviii. figs. 7-9. 
This form has also been found in the Red Chalk of Speeton, and 
the Gault of Montcley, Doubs (Berthelin) ; and also in several other 
formations of earlier and later ages. The specimens from the Folke- 
stone Gault agree with the Speeton specimens in point of size, and 
there is also present in some examples a thickened centre, mentioned 
by Messrs. Burrows, Sherborn, and Bailey. It occurs in the Gault in 
zone ii., specimen c., very rare ; zone xi., 55 ft. from the top, very 
rare ; 50 ft., very rare ; 40 ft., very rare ; 25 ft. rare. 
Trochammina Parker and Jones [1859], 
Trochammina concava, plate VI. figs. 14 a and h. 
Test, a nautiloid spiral ; thin, and with a somewhat large 
umbilical excavation on each face. About five segments visible in the 
later portion of the shell, all of which are more or less concave ; the 
sutures well marked. The shell is almost bilaterally symmetrical. 
Aperture a curved slit inclined to one side. Test, finely arenaceous, 
the surface somewhat smooth and of a grey colour. Diameter 1/30 
in. Found in zone iii., rare ; zone xi., 40 ft. from the top, very rare. 
Family TEXTU LARIIDyE. 
Sub-family TEXT ULA RIINM 
Textularia Defrance [1824]. 
Textularia minuta Berthelin, plate YI. fig. 15. 
Textularia pygmeea Reuss, 1862, Sitzungsber. k. Ak. Wiss. Wien, 
vol. xlvi. p. 80, plate ix. fig. xi. T. minuta Berthelin, 1880, Mem. 
Soc. geol. France, ser. 3, vol. i. Mem. 5, p. 26. 
This species was referred to as T. pygmeea by Dr. Reuss, but 
d’Orhigny having previously given this specific term to another, and 
distinct species, it has been renamed by M. Berthelin in the Memoir 
on the French Gault Foraminifera above quoted ; it will therefore he 
necessary to deal with all references to T. pygmsea Reuss, in my first 
paper of this series, as T. minuta Berthelin. It is a very distinct form 
in the Gault washings, excepting in the uppermost portion of zone xi., 
where it tends to become larger and more attenuated. The specimen 
from which the figure was taken is from zone iv. Dr. Reuss obtained 
his specimens from the Minimus-thon of North Germany ; Messrs. 
Burrows, Sherbom, and Bailey obtained this species from the Red 
